Insulating structure.



A. B; REYNDERS (is J. E. MATEER.

INSULATING STRUCTURE.

APPLICATION FILED MAY 13, 1909.

' Patented Feb. 14, 1911.

. z 6 NTORS WITNESSES:

A'TTORNEY v i-iron T OFFICE;

AKTHUB. it. newness Ann JESSE n. Hummer wrnnrfi'snune; rh'n'iis'ttnvhnn, ASSIGNOfiS 'fO' WESTINGHOUSE ELECTRIC 51W) MANUFKC'YURIKG 'UOMfKNY, A

oonronertoit or rennsrrvmm.

I INSULATING srnocruitn.

Application filed my 13, 1909. Serial No. 495390.

Tagll whom it may concern: H

Be it known that We, ARTHUR B. REYN- and Jesse E. MATEER, both citizens of the United States, and residents of Wilkinsburg, in the county of Allegheny and State of f ennsylvania, have invented a newand use-ill Improvement in Insulating Structures, of which the following is a specifiiil our invention relates tov insulating strucmiss, and it has special refer "'ceto insulating'f' Bushings win-chem adapt d to separate the leads of transformers an other higln voltage electric "apparatus the metal tanks or casings through whi h they rcject. Ikeobject of but invention is to provide bushings f the class abov indicated that shall he durab'l'eflin construction and adequatefpr outdoor service, in connection with very highotential ircuit conductors" me te h gh-voltage service-, bushings of the eenieaeeudenser type have; successfu'lly utili' d for insulating the leedsot transformers, "ci cit -breakers and other de vices from the metal cases in which the devices erecontemed V According to our present invention, We

have inodified this type ofinsulation for the purpose of adapting it' t o" outdoor service. In our e pending application,- SerialNo. 495,771 filed even date herewith, we have illustrated described means for equalizing the p10 entiiil strains t 'foughout the insulating body by inipressin suitably graded yoltttges on the several conducting layer-sot theijrlisulation This some means may be found de'slrable for useln connection with the Bushing of our present invention, but its scope is not limited in this regard.

Figure 1 of the accompanying drawings is an elevation of a bushing constructed in aocordance with our invention and Fig. 2 is a sectional view,- on a larger scale, of a por-f tion of the bushing shown in Fig. 1.

Referring to thcdrawings, with special refeience to Figs. 1 and 2 the bushing here illustrated comprises a. cylinder 1 composed of alternate layers 2 and 3 of insulating and conducting materials and mounted upon a 7 rod or tube 4: of conducting" material that ;i n'ay 'be connected in an electric circuit and may constitutethelead of a' transformer or other electrical device. The

protected from the weather. meta-l skirts rather than skirts of porcelain or like substance avoids breakage and reninne'rinost layersof the cylinder are relatively long and outermost layers are 'relatively short,- so the-ta stepped structure is provided vin which the extremities of adjacent conducting": layers are separated by a material length oi insulation.

transformer or other device isiimnersed in v 011, according to the usual practice for very high voltage service the inner end of the bushlng is usually oil-immersed. The outer Patented Feb. '14, ten,

end of the bushing is provided with a series of bells oriskirtsaoif sheet metal or other suitableconducting material, which are electrically connected to" the several conducting layers ofthe'bushing' and are sub-ported in position the ends of the insulating lay 'elr's." The bells or skirts are'spaioe'd apart by porcelain sleeves 6 which are Incunted uon thexposed ends of the respective insulating layers and which more fully protectthe bushing from the weather;

flThe'eX'ti-eine end of the terminal is provided with a cap 7 which is fastened to the end of theetube or 4 and is so consti ucted, of nietal or other conducting material, as tq ffilll'l an electrical connection to a terminal member without exposing any;

joints through whichinoisture might pass.

The edges of the cap 7 overhang the outermost hell or skirt 5. and these parts overhang each other so that thebushing, and particularly the ends of the layers, are thoroughly ders the terminal lighter in weight.

' 'While the structure illustrated is considered The use of dcsire that only such limitations shall be imposed as are indicated in the appended claims. We claim as ourinvention 1. An insulating bushing, comprising'u plurality of concentric cylinders of conduct 1 "mg material, separating cylinders .of insulilting material and overhanging bells or skirts of conducting material mounted upon tween the inner and the outer surfaces of the bushing. I a v 2. An insulating bushing, comprising a plurality of concentric layers of insulating and conducting materials of graded lengths to provide a series of steps, and overhanging skirts of conducting material fitted upon the steps and-electrically connected to the conducting layers.

'3. An insulating bushing, comprising a plurality of concentric'layers ofinsulating r and conducting materials of'graded lengths to provide a series of steps, overhanging metal skirts which are fitted upon the respective steps and are electrically connected to the conducting layers, and a bell-shaped metal cap or crown.

4. An insulated lead structure for elec trical apparatus, comprising concentric conductors, separating insulating tubes of graded lengths to form a series of steps, and overhanging" skirts of conducting material severally supported upon the steps and connected electrically to the ends of the concentric conductors.

In testimony whereof, We have hereunto subscribed our names this 4th day of May,

ARTHUR B. REYNDERS. JESSE E. MA'IEER. Witnesses:

F. CREEDY,

B. B. HINES. 

